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Hi,
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The motor assembly is held in place with tabs and possibly one screw. Remove the light assembly and once you get to the fan itself, unplug it, and push the side of the unit outward to release the tabs. You push the fan assembly up while pushing out on the side. If you look closely you can see the slots where the tabs go. There may or may not be a screw holding it in place. After you release one side, then rotate the fan assembly down and out.
http://coastaltechsupply.com/Direct%20Order%20Pages/Nutone%20Direct%20Orders/Fans/8663P.htm

I ran into the same problem, Lowe's carries Broan exhaust vents. They had both a replacement motor for all generations of 678 fans for $18, and they also had the latest generation of the complete unit for $40. I bought the complete unit, which included the fan I needed. Just unbolted it from the new bracket and bolted it to the old one. The new light housing, trim piece, and lens also interchanged. The existing one was old and yellowed, so this made for a huge improvement. All done from in the living space as well.

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Not sure what you are asking, but you can get a replacement directly from Sears. It is okay to replace just the motor, but be sure the fan blades are completely cleaned. When you are all done, verify good air flow outside of the building.

You can buy just the motor assembly. You would remove the grill. Usually there is a plug to disconnect the motor. Remove screw(s) and the motor and fan assembly will come out leaving the rough in housing in the ceiling. I did not locate your model number as you listed it however the QT line has numerous model numbers. Here is a link to the nutone page. You should be able to purchase a "trim kit" which would include the fan,motor,and grill. You can either buy it on-line, or you might try an electrical supply company. http://www.nutone.com/product-detail.asp?ProductID=11043

I ran into the same problem, Lowe's carries Broan exhaust vents. They had both a replacement motor for all generations of 678 fans for $18, and they also had the latest generation of the complete unit for $40. I bought the complete unit, which included the fan I needed. Just unbolted it from the new bracket and bolted it to the old one. The new light housing, trim piece, and lens also interchanged. The existing one was old and yellowed, so this made for a huge improvement. All done from in the living space as well.

It is really easy to change the motor yourself. It is about a 15 minute job. You just need to find your model number and then you can buy the complete motor assembly. https://www.centralvacuumstores.com/model_number_help.php